Make fast=0 fail

circleci/config.yml

@@ -1,13 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: debian:stretch
-    steps:
-      - checkout
-      - run:
-          name: Greeting
-          command: echo Hello, world.
-      - run:
-          name: Print the Current Time
-          command: date

programs/zstdcli.c

@@ -568,6 +568,8 @@ int main(int argCount, const char* argv[])
                             fastLevel = readU32FromChar(&argument);
                             if (fastLevel) {
                               dictCLevel = cLevel = -(int)fastLevel;
+                            } else {
+                              CLEAN_RETURN(badusage(programName));
                             }
                         } else if (*argument != 0) {
                             /* Invalid character following --fast */

tests/playTests.sh

@@ -108,6 +108,7 @@ $ECHO "test : --fast aka negative compression levels"
 $ZSTD --fast -f tmp  # == -1
 $ZSTD --fast=3 -f tmp  # == -3
 $ZSTD --fast=200000 -f tmp  # == no compression
+! $ZSTD -c --fast=0  tmp # should fail
 $ECHO "test : too large numeric argument"
 $ZSTD --fast=9999999999 -f tmp  && die "should have refused numeric value"
 $ECHO "test : compress to stdout"